Ziziphi iimfuno ezikhethekileyo zokukhethwa kwesiqu sevalve

Izinto zokwenziwa kweendawo zevalvu kufuneka zikhethwe ngokwezi zinto zilandelayo:

1. Uxinzelelo, ubushushu kunye neempawu zendlela yokusebenza.

2. Amandla enxalenye kunye nomsebenzi wayo kwiivalveisakhiwo.

3. Inokwenziwa ngcono.

4. Ukuba le miqathango ingentla ifezekisiwe, kufuneka kubekho iindleko eziphantsi.

Izinto zesiqu

Ngethuba lokuvula kunye nokuvalwa kwe-valve, i-valve stem ithwala imikhosi yoxinzelelo, uxinzelelo kunye ne-torsion, kwaye idibene ngokuthe ngqo kunye ne-medium.Ngexesha elifanayo, kukho ukunyakaza okuhambelanayo kunye nokupakisha.Ngoko ke, i-valve stem material kufuneka yanele kwiqondo lokushisa elichaziweyo.Amandla kunye nokuqina kwempembelelo, inqanaba elithile lokuxhathisa umhlwa kunye nokumelana nokukrala, kunye nokwenziwa okulungileyo.

Izinto ezisetyenziswa ngokuqhelekileyo kwi-valve stem zezi zilandelayo.

1. Intsimbi yekhabhoni

Xa isetyenziswa kumanzi kunye nomphunga ophakathi kunye noxinzelelo oluphantsi kunye nobushushu obuphakathi obungagqithiyo kwi-300 ℃, i-A5 yentsimbi eqhelekileyo yekhabhoni isetyenziswa ngokubanzi.

Xa isetyenziswa kumanzi kunye nomphunga ophakathi kunye noxinzelelo oluphakathi kunye nobushushu obuphakathi obungagqithiyo kwi-450 ℃, i-35 yekhwalithi ephezulu ye-carbon steel isetyenziswa ngokubanzi.

2. Intsimbi ye-alloy

I-40Cr (intsimbi ye-chrome) isetyenziswa ngokubanzi xa isetyenziselwa uxinzelelo oluphakathi kunye noxinzelelo oluphezulu, kwaye iqondo lokushisa eliphakathi alidluli i-450 ℃ emanzini, umphunga, i-petroleum kunye nezinye imidiya.

I-38CrMoALA intsimbi ye-nitriding ingasetyenziswa xa isetyenziswa emanzini, umphunga kunye nezinye izinto zosasazo ezinoxinzelelo oluphezulu kunye nobushushu obuphakathi obungagqithiyo kuma-540℃.

I-25Cr2MoVA chromium molybdenum vanadium intsimbi isetyenziswa ngokubanzi xa isetyenziswa kwindawo yoxinzelelo oluphezulu lomphunga kunye nobushushu obuphakathi obungagqithiyo kuma-570 ℃.

Ezintathu, intsimbi enganyangekiyo eneasidi

Isetyenziselwa imidiya engadlekiyo kwaye ibuthathaka kwaye inoxinzelelo oluphakathi kunye noxinzelelo oluphezulu, kwaye ubushushu obuphakathi abugqithi kuma-450 ° C.I-1Cr13, i-2Cr13, i-3Cr13 i-chromium insimbi engenasici inokukhethwa.

Xa isetyenziswe kwimithombo yeendaba ezonakalisayo, intsimbi enganyangekiyo ye-asidi efana ne-Cr17Ni2, 1Cr18Ni9Ti, Cr18Ni12Mo2Ti, Cr18Ni12Mo3Ti, kunye ne-PH15-7Mo yentsimbi eqinile yeprecipitation inokukhethwa.

Okwesine, intsimbi ekwazi ukumelana nobushushu

Xa isetyenziselwa iivalvu zobushushu obuphezulu ezinobushushu obuphakathi obungadluliyo kwi-600℃, i-4Cr10Si2Mo martensitic i-heat-resistant steel steel kunye ne-4Cr14Ni14W2Mo intsimbi ye-austenitic ekwazi ukumelana nobushushu ingakhethwa.